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Top 10+ Best Fish For 20 Gallon Tank That You Can Not Miss!


Choosing the best fish for 20 gallon tank is not as simple as you might think because it depends on both objective and subjective factors.

You must understand the behavior of the fish and their growth potential to ensure compatibility and cohesion when kept in a 20 gallon tank. Also, make sure that the temperature, PH, lighting, plants and decorations in the 20 gallon aquarium are suitable for the fish you keep.

Your ingenuity and understanding will help fish live in a safe and healthy ecosystem. The following article will help you find out the Top 10+ best fish for 20 gallon tanks.


Top 10+ Best Fish For 20 Gallon Tank

#1. Zebra Danio - Our top pick


Zebra Danio

Zebra Danio is one of the best tropical fish for 20 gallon tank. Zebra Danio is very popular among fish lovers. Zebra Danio's maximum size is 3 inches.

With this modest size, you can easily keep larger numbers of them because they are not aggressive but often swim in groups.

Their nature is gentle and friendly. The ideal water temperature for this best fish for 20 gallon tanks is up to 75 ° F and PH between 6.5 and 7.5.

#2. Platy



# 3. Dwarf Gourami

Dwarf Gourami

Dwarf Gourami

Dwarf Gourami possesses the appearance as its name implies. Its maximum size when large is only 2.5 inches.

Although small, Dwarf Gourami has quite good heat resistance and is suitable for tropical countries all year round.

This fish is an omnivore and has a low mortality rate compared to other fish. However, you should have two males in 1 aquarium because they have a very high ability to fight.

#4. Swordtail



Swordtail is considered one of the best fish for 20 gallon tank in the world with its personality and appearance. You should only keep 1 to two females and 1 male.

Swordtail's maximum size ranges from 4 to 5 inches. To make this fish live longer, you should make sure the pH of the aquarium sits between 7.0 and 8.2.

The required water temperature for Swordtail is between 63 and 81 ° F. The impression of this best fish for 20 gallon tanks is that the tail is like a sword.

#5. Molly Fish - Best Centerpiece Fish For 20 Gallon Tank

Molly fish

Molly fish

Molly fish is best centerpiece fish for 20 gallon tank or 30 gallons. It survives well with temperatures between 75 and 82° F and PH 7.5 to 8.5. The maximum size of Molly fish is up to 6 inches.

Molly fish's personality is extremely sociable and friendly. In addition, molly fish adapted to the new environment more quickly than other fish. Molly fish can live with a high density of fish without stress.

Your aquarium will always be clean because molly fish likes to eat algae as well as surrounding dirt.

# 6. Cory Catfish


Cory Catfish

Cory Catfish comes from Brazil or South America with many varieties and colors. Its minimum size is only 2 inches and the maximum size is 9 inches.

Although the size is not large, the lifespan of Cory Catfish can be up to 10 to 20 years if you keep it cool. Because of her swarm and gentleness, Cory Catfish is one of best fish for 20 gallon tanks.

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If you want a 20 gallon wide aquarium then clean the tank and make sure there are no more than 10 catfish in the tank.

# 7. Fancy Guppy


Fancy Guppy

The Fancy Guppy is a fairly inexpensive fish that easily lives in a variety of environments. The Maximum size of this best fish for 20 gallon tank is 2.4 inches.

The lifespan of this fish is quite short to only 2 years. Their behavior belongs to omnivores. In addition, due to their sociable properties, they can coexist with the best tropical fish for 20 gallon tanks.

#8. Harlequin Rasbora


Harlequin Rasbora

Harlequin Rasbora is one of the most swarmed fish in the world. The maximum size of this fish is only 2 inches.

Harlequin Rasbora comes in a variety of colors to help you make the aquarium more vivid and colorful.

Their personality is not only sociable but not fussy about eating. So you can feed them both plant foods and bloodworms. You can buy this fish with 8 to 10 other fish like Neon Tetra, catfish or betas, ...

# 9. Otocinclus



Otocinclus can be as large as 2 inches. Despite its small size, the Otocinclus speed is extremely fast. The appropriate water temperature for this best fish for 20 gallon is from 72 to 79 degrees Fahrenheit.

The PH of the 20 gallon tank should be from 6.8 to 7.5. You can keep Otocinclus and gentle fish like Cory Catfish. Bolivian Ram, Angelfish,...

#10. Neon Tetra


Neon Tetra

Neon Tetra has a maximum size of only 1.5 inches. Because of its small size, you can keep many other fish species at the same time. Neon Tetra's food is larvae, tubifex, algae, ...

You don't need to put in too much effort, Neon Tetra can live up to 8 years. You can keep 10 to 25 neon tetra in a 20 gallon tank.

Frequently Asked Questions

Question 1: How much fish can I put in a 20 gallon tank?

Answer: There is no specific number. However, if you want your tank to be filled with different types of fish, don't forget to research each fish, water temperament, PH, temperature, their size and social behavior.

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You can opt to keep more fish in a 20 gallon tank if you choose some that prefer bottom swimming and some prefer to hover over the water.

For single fishes, you should not keep them in pairs or herds because it will make their living atmosphere extremely stressful.

It is important to try to create ample space for some fast-growing fish and not to over-stock the fish.

Question 2: What is the best 20 gallon aquarium?

Answer: A great suggestion for you is the 20 gallon long Aquarium Masters which is 30.25 ″ x 12.5 ″ x 12.75 ″. This product features high-quality glass and anti-rust silicone edges. In addition, you can also refer to some of the following quality products: Aqueon 20 gallon long tank.

Question: 3: How many neon tetras can I put in a 20 gallon tank?

Answer: You can keep 24 neon tetras in a 20 gallon tank at once. This quantity ensures your aquarium is both clean and has healthier neon tetras.

See more via You Tube: The BEST Ideas for your 20 Gallon Aquarium

Sum up

Through this articles, you definitely have your own choice, right? We hope the above suggestions can help you no longer fret in the process of choosing the best fish for 20 gallon tank.

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About the Author James

Hey, I'm James – An admin of Happy Pet Pets. If you're reading this, you must share the same interest as me – A fish lover. I fall in love with many types of fish species: Betta fish, Goldfish, Koi fish, Tilapia, Carp, Perch, and so much more. I enjoy great happiness moments with my fish family, from raising to creating a new better home for them. That's how I gained lots of experience in taking care of my adorable fish, and I'm ready to share with you all now.

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